Which mathematical concept became widely adopted in product design during the mid-20th century 'form follows function' movement and remains influential in packaging that consumers find visually appealing?

The intersection of mathematics and product design has led to some of the most visually appealing and functional items in our everyday lives. One mathematical concept has been particularly influential in creating aesthetically pleasing designs across industries. This trivia question explores how mathematical principles have shaped modern product design approaches and influenced consumer perception of beauty and balance in retail products.

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The Golden Ratio (approximately 1:1.618)
Pascal's Triangle sequences
The Reimann Zeta function
Fourier transformation principles